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5sinx-12cosx=-13sin3x, if sinphi=12/13, ...

`5sinx-12cosx=-13sin3x, if sinphi=12/13`, then `(a)sin(2x-phi/2)=0 (b)sin(x+phi/2)=0 (c)cos(x+phi/2)=0` `(d)cos(2x+phi/2)=0`

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